Happy New Year Game Machine

9LEDGuessGamePcbV2_20231108015953.zip

PDF_Happy New Year Game Console.zip

Altium_Happy New Year Game Console.zip

PADS_Happy New Year Game Console.zip

BOM_Happy New Year Game Console.xlsx

97273

Voron 12/24V, 3D printer aluminum substrate heated bed 100*100, compatible with Voron 0.1

Based on designs by other authors, this board is compatible with 12/24V, has a 0603 surface mount resistor, and has a power rating of approximately 100 watts. In actual testing, it takes about 40 seconds to heat up from 30 degrees Celsius to 60 degrees Celsius.

The title suggests a 12V/24V aluminum substrate heated bed. Seeing that no one on the open-source forum had made a 24V heated bed, I designed one based on other authors' boards. [Image of
finished product]. The parameters are shown in the image. The resistance of the two circuits is roughly the same and acceptable. I haven't measured the actual power, but the total power consumption (24V) is around 100 watts, which is also acceptable. The blue bed board in the picture is made of ABS. Due to design flaws, it had grooves. Those who need it can make one themselves, or I will add it in a later update. However, the precision is a bit lacking, and it's prone to high-temperature deformation. The ideal method is to use a solid aluminum plate. For fixing, you can use double-sided tape or drill holes and screws. Remember to apply some thermal grease for better results. The downside is that it has all right-angle turns... [Adjust the thermistor parameters according to your needs]. Generally, it's an NTC100K. Inspired by a neighbor's 9-piece panel 350 heated bed, this board is theoretically applicable as well, although the series connection is a bit troublesome. 6.678 ohms * 9 equals approximately 60 ohms. If connected to 220V mains power, it would be about 800 watts... High voltage is dangerous, please operate with caution! ~~~~ Here comes the follow-up... Apply some glue before setting up! -------------- Ready to start the feast! Power on ---------- A note: some students who are not familiar with circuits may not know how to wire. Actually, the circuit of this board is equivalent to two 12V resistors connected in series. The 0V on the board represents the common terminal, which is the series connection point. When connected to a 12V power supply, the positive terminal is connected to the 0V terminal, and the negative terminal is connected to both 12V terminals. If only one 12V terminal is connected, only half of the circuit works. When connected to 24V, the positive and negative terminals are connected to the two 12V contacts respectively, and the 0V terminal can be ignored.
 


 
 


 

 



 

 

PDF_voron12-24v, 3D printer aluminum substrate heated bed 100_100, compatible with voron 0.1.zip

Altium_voron12_24v, 3D printer aluminum substrate heated bed 100_100, compatible with voron 0.1.zip

PADS_voron12_24v, 3D printer aluminum substrate heated bed 100_100, compatible with voron 0.1.zip

BOM_voron12_24v, 3D printer aluminum substrate heated bed 100_100, compatible with voron 0.1.xlsx

97274

elrs_8266_rx

ELRS, a low-cost receiver built using A28 and ESP_12F.

ELRS, a low-cost receiver built using the A28 and ESP_12F.
Flashed with the official Betafpv Nano RX firmware.
See details at: https://www.bilibili.com/video/BV1Uu4y1t7Fk/

PDF_elrs_8266_rx.zip

Altium_elrs_8266_rx.zip

PADS_elrs_8266_rx.zip

BOM_elrs_8266_rx.xlsx

97275

51 Development Board Color Version

Classics never go out of style, and 51 will never be out of fashion.

Looking back, my first development board was the 51 microcontroller. It successfully opened the door for me to learn microcontrollers. Today, I'm taking this opportunity to build a 51 development board. This board uses a fully through-hole design, making soldering easy. It also has very few components, making it easy to learn both PCB design and development board learning – a truly ingenious tool for beginners. Interface Simplified
Instructions:
[Image of the board]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Soldering Instructions:
Regarding LEDs: The longer lead of the LED is positive, and the shorter lead is negative. When soldering, align the longer LED lead with the end marked with a plus sign on the pad, or align the shorter lead with the end with a notch on the pad.
Regarding electrolytic capacitors: Similar to LEDs, the longer lead is positive, and the shorter lead is negative. Align the longer lead with the end marked with a plus sign on the pad
. Regarding resistor arrays: Align the end of the resistor array with the end marked with a white dot on the pad. [
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Verification Video]

Verification video.mp4

PDF_51 Development Board Color Version.zip

Altium_51 Development Board (Color Version).zip

PADS_51 Development Board (Color Version).zip

BOM_51 Development Board Color Version.xlsx

97276

CW32-based multi-functional test pen

"Dianjing" multi-functional test pen based on CW32F030C8T6

Replicated from https://oshwhub.com/heyh/dian-jing-testpen
He Gong, you did a great job!

0f257196c8c69c6ebd76 -original-original.gif

Demo video.zip

ceshibi.zip

PDF_Multifunctional Test Pen Based on CW32.zip

Altium_CW32-based Multifunctional Test Pen.zip

PADS_CW32-based Multifunctional Test Pen.zip

97277

Battery Internal Resistance Tester Based on CW32 Microcontroller

Battery Internal Resistance Tester Based on CW32 Microcontroller

 
The physical verification video
 
is available at https://www.bilibili.com/video/BV1Gc411X7Vt/?vd_source=c212050d120d3457e1f6d0cd79c641de.
 
 
This is a battery internal resistance tester based on the CW32 microcontroller, using a 1kHz AC signal for excitation, with a constant current of 12mA. The withstand voltage has not been tested, but it is estimated to be capable of 300V. It has two ranges: 4 ohms (minimum resolution 0.1mΩ) and 400mΩ (minimum resolution 0.01mΩ), switchable via buttons.
 
The circuit mainly consists of a constant current excitation section and a signal amplification section.
 
The diagram below shows the signal excitation section. The microcontroller outputs a 1kHz PWM signal, which is converted to a sine wave via an RC circuit before entering the constant current circuit at 12mA. A TVS diode is used for protection, with a wire-wound resistor added before the TVS diode for protection. Two 1uF capacitors are connected in parallel as DC blocking capacitors.
 
 
 
The diagram below shows the signal amplification section. DC is isolated by a 104 capacitor, then boosted to 1.65V. The transistor here is used as a diode for protection circuitry. A 100K resistor is connected in series for added safety. The signal then enters an instrumentation amplifier composed of three op-amps, amplifying 21 times (the ohm range amplifies 21 times). The final op-amp amplifies another 10 times. With the analog switch off, the attenuation amplification is 210 times, corresponding to the milliohm range.
 
 
 
The software section is available for download: source code and firmware in nei_zu_yi.zip (1.s is the source code, 1.bin is the firmware).
 
 Calibration method:
The three calibration menus
display P-00 for short-circuit zeroing,
P-01 for phase calibration,
and P-02 for standard resistance calibration.
Press and hold the switch button while simultaneously pressing another button to enter calibration mode. The digital display shows P-00. Pressing the switch button will toggle between P-00, P-01, and P-02. Pressing both buttons simultaneously exits the calibration menu (END is displayed). Pressing the other button enters the displayed menu.
 
P-00 Short-circuit the clip. Set both buttons to 0 for addition and subtraction. First, adjust the ohm range. Press both buttons simultaneously to enter the milliohm range. After adjusting, press both buttons simultaneously to save to FLASH. Display END.
 
P-01 Clamp a resistor with a known phase. First, adjust the ohm range for phase calibration. Adjust it to the true phase of the resistor. I don't know the value of my resistor, so I adjusted it to 0 degrees. After adjusting, press both buttons simultaneously to enter the milliohm range for phase calibration. Adjust it as above, then press both buttons simultaneously to save to FLASH. Display END.
 
P-02 Clamp a standard resistor and adjust the reading to match the resistance. Also, first, adjust the ohm range. Press both buttons simultaneously to enter the milliohm range. After adjusting, press both buttons simultaneously to save to FLASH. Display END.
 
Microcontroller timer output 1 channel 1kHz PWM
 
 
ADC. Set the sampling rate to 1MHz. Clock settings
:
ADC settings.
 
DMA settings: Transfer 2000 points to memory.
 
SYSTICK timer settings: Interrupt once every 2 milliseconds.
 
 
Enter the SYSTICK interrupt.
 
First, reinitialize the DMA
 
 
and calculate 2000 points of DFT. The real and imaginary parts are respectively entered into a 400-point sliding filter.
 
 
 
The collected data is put into OCTAVE.
 

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b = reshape(a',1,2000) b = b-2048 c = 0:1999 plot (c,b)
 
 
 
 
obtains the real and virtual parts, and after rotating the phase, displays
 
 
 
the actual internal resistance circuit board.
 
 
 
 
 
 
 
 

nei_zu_yi.zip

PDF_Battery Internal Resistance Tester Based on CW32 Microcontroller.zip

Altium_Battery Internal Resistance Tester Based on CW32 Microcontroller.zip

PADS_Battery Internal Resistance Tester Based on CW32 Microcontroller.zip

BOM_Battery Internal Resistance Tester Based on CW32 Microcontroller.xlsx

97278

USB expansion

A docking station built using MA8601 with four expansion ports and two power supply ports.

One day, I suddenly realized I didn't have enough USB ports on my computer. As an electronics enthusiast, how could I tolerate that? I decided to make a USB extender.
 
The schematic is based on an open-source platform, borrowed from a master. For the PCB design,
 
I'll just mention some important points:
1. PCB routing: Signal lines should be differential. I was in a rush here, and the crystal oscillator's length was slightly off, causing unstable speeds for USB drives, but it was sufficient for the mouse and keyboard. You can adjust this when you redesign yours.
2. When soldering, I recommend soldering the Type-C port first. This is the most difficult part of the board and is prone to solder bridging.
After soldering, I suggest short-circuiting it. Alternatively, you can use other interfaces instead of Type-C; the principle is the same. 3. After soldering all components, I recommend short-circuiting VCC, GND, and resistors and capacitors. Note that the fuse must provide continuity.
4. For the first power-on, I recommend using a power bank, as power banks have short-circuit protection. Then connect it to the computer.
Below are my test results for the keyboard and mouse; there was no lag when typing or drawing.